function check(field)
{
    for (i = 0; i < field.length; i++)
    {
	field[i].checked = true;
    }
}
function uncheck(field)
{
    for (i = 0; i < field.length; i++)
    {
	field[i].checked = false;
    }
}

function enter2tab(e)
{
    if (!e)
    {
	var e = window.event;
    }

    if (e.keyCode)
    {
	code = e.keyCode;

	if (e.which == 13)
	{
	    e.returnValue = false;
	}
    }
    else if (e.which)
    {
	code = e.which;

	if (code == 13)
	{
	    return false;
	}
    }
}